I agree with Viper21. The Davis was a little to over zealous in the beginning. The first shot should not have been taken by the South. The North should have been made out to be the aggressor and public opinion would have been swayed in favor of the South. Especially abroad.
Agree although the impact might have been even greater inside the US, especially in the north as the opposition to Lincoln's decision not to let the states go would have been larger if the north had fired the 1st shots.
IIRC someone mentioned that the south offered to purchase Ft Sumpter and other such military outposts in their territory. Lincoln rejected that but was it a public offer and if not would it have made a difference if they had made it public?